Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d5a947623ce868…

MALICIOUS

PDF

31.4 KB Created: 2021-07-19 09:15:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2b9373d9182dd7949930ebb08e6bcc0e SHA-1: 71e990a67fd514796cf7a020b9924d682a8c4d75 SHA-256: 77d5a947623ce868995cd21050754d77489ac28a4385ceaef64bc29da6305957
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising a "free generator / game hack". The ML classifier also flagged this PDF as malicious. The embedded links and the lure suggest an attempt to trick users into downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9400

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/roblox-land-free-robux-game-hack In PDF document text
    • https://www.e-learning-mas-dailkhairaat.com/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mas-dailkhairaat.com/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mas-dailkhairaat.com/__statics/gudangsoal/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.e-learning-mas-dailkhairaat.com/__statics/gudangsoal/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x260B 22340 bytes
SHA-256: ac5567be92823606c608a24371104d4111ea947f8ab82254a23b0aba273d9090
font_01_sfnt_off000057d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57D0 18676 bytes
SHA-256: 201eec741a4a9318b7960378d2239a1ac49bcfaff0936d11c8f1de9fb0956b79

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